+ if (elt->size > 0) {
+ /* initialize on first pass */
+ if (self->size == 0)
+ self->size = elt->size;
+
+ if (self->size == -1) {
+ *size = 0;
+ amfree(buf);
+ return NULL;
+ }
+
+ if (*size > (guint64)self->size) {
+ /* return only self->size bytes */
+ *size = self->size;
+ self->size = -1;
+ } else {
+ self->size -= *size;
+ }
+ }
+